UNUSUAL ORGANIZATION OF A RIBOSOMAL-PROTEIN OPERON IN THE PLASTID GENOME OF CRYPTOMONAS PHI - EVOLUTIONARY CONSIDERATIONS

被引：24

作者：

DOUGLAS, SE

机构：

[1] Atlantic Research Laboratory, National Research Council, Halifax, B3H 3Z1, Nova Scotia

来源：

CURRENT GENETICS | 1991年 / 19卷 / 04期

关键词：

CRYPTOMONAD ALGAE; PLASTID; RIBOSOMAL PROTEINS; STR OPERON;

D O I：

10.1007/BF00355057

中图分类号：

Q3 [遗传学];

学科分类号：

071007 ; 090102 ;

摘要：

The region of the plastid genome containing the genes for ribosomal proteins S12 and S7 and the elongation factor Tu (corresonding to three of the four str operon genes of Escherichia coli) was investigated in the unicellular marine alga Cryptomonas. Sequence analysis shows the gene organization to be rps12-60 bp spacer-rps7-68 bp spacer-tufA. No introns are present in any of the genes. Comparisons of the deduced amino acid sequence of these genes with homologues from other organisms show rps12 to be very highly conserved, except at the amino terminus, and rps7 and tufA to be less well-conserved. Transcript analysis suggests that these genes are co-transcribed along with several up and/or downstream genes. The evolutionary significance of this unique gene organization is discussed.

引用

页码：289 / 294

页数：6

共 54 条

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